U.S. Rep. Jim Bridenstine was the only member of Oklahoma's U.S. House delegation to vote against President Obama's request to train and arm rebels fighting Islamic State militants in Syria.
Bridenstine says that if the Islamic State is deemed a threat, the United States should "eliminate it," not train and arm rebels.
Lankford said the plan is similar to recent proposals in Iraq.
Watch: U.S. Rep. James Lankford explains his vote on the amendment to arm Syrian rebels, followed by his remarks on the House floor
"ISIS would have already overrun Iraq if we had not trained the Iraqis and the Kurds in the years past," Lankford said. "So we need to be able to do the same thing in Syria for them to be able to defend themselves and be able to defend for what is uniquely American values as well, and for uniquely American priorities."
But during floor remarks in support of the amendment, Lankford criticized President Obama for not having a longer-term strategy to defeat the Islamic State.
"Bombing some of ISIS' facilities and training 5,000 foreign fighters is not a plan," Lankford said. "If ISIS is a direct threat to the United States, we should treat them that way. It's going to make the American people second-guess the treat, by saying the American people will be protected by the Free Syrian Army."
The U.S. Senate is expected to take up the proposal Thursday.
The proposal was added to a must-pass, stopgap spending bill to keep government agencies operating into December. The measure is the last major business on Capitol Hill before lawmakers depart this week.
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